Mystery hose January 08, 2021, 03:07:21 pm Upper radiator hose blew. So while peeking around to gauge what I am into repair wise, I found this hose. I tried to find where it goes when it started to rain. It is the hose on the right side, middle of foto. It looks as though it has been 'sheared' off. It is thin walled and ribbed. Bottom of engine is the left side of the foto. Any ideas olease? 1990 G30, 5.7l....
Re: Mystery hose Reply #1 – January 08, 2021, 04:02:20 pm Hi MIP; If I remember, that is a heat riser from the exhaust manifold to the choke mechanism on the carburetor. Warm air from the manifold warms up the choke to shut off the rich mixture needed for a cold engine. Pretty quick after the engine is running, but before the hot water and warmth of the intake manifold take over to shut off the choke. Intact you might use a little less gasoline during warm up, but not enough to matter. Larry owned one near this vintage, so he should know for sure. It might have been just to feed warmer air into the air cleaner to evaporate gasoline more easily; some type of smog control. RonB 2 Likes
Re: Mystery hose Reply #2 – January 08, 2021, 04:46:10 pm Quote from: Mindispower - January 08, 2021, 03:07:21 pmUpper radiator hose blew. So while peeking around to gauge what I am into repair wise, I found this hose. I tried to find where it goes when it started to rain. It is the hose on the right side, middle of foto. It looks as though it has been 'sheared' off. It is thin walled and ribbed. Bottom of engine is the left side of the foto. Any ideas olease? 1990 G30, 5.7l....The ribbed tube looks like the hose that is used for the carburator or throttle body intake-air heat, used when the engine is cold.Look to see if the air cleaner has a snorkle, with an outlet on the bottom, where a hose could connect.Where does the other end of the hose go to ?Larry
Re: Mystery hose Reply #3 – January 08, 2021, 05:17:04 pm Quote from: Larry W - January 08, 2021, 04:46:10 pmThe ribbed tube looks like the hose that is used for the carburator or throttle body intake-air heat, used when the engine is cold.Look to see if the air cleaner has a snorkle, with an outlet on the bottom, where a hose could connect.Where does the other end of the hose go to ?LarryI will check tomorrow. Just finished the upper hose repair and the weather is rather inclement right now. Thanks Larry.
Re: Mystery hose Reply #4 – January 08, 2021, 06:35:12 pm As they said, heat riser hose one end to the bottom of the air cleaned snorkel , the other end to flange on the exhaust manifold on that side.Jon 1 Likes
Re: Mystery hose Reply #5 – January 08, 2021, 10:49:45 pm Quote from: Mindispower - January 08, 2021, 05:17:04 pmI will check tomorrow. Just finished the upper hose repair When changing radiator and heater hoses, unless using the stock spring type clamps, the screw clamps need to be retightened after a hundred miles or so. The clamps sink into the hoses and loosen their hold.https://images.carid.com/omix-ada/cooling-systems/17115-01.jpgLarry 1 Likes
Re: Mystery hose Reply #6 – January 09, 2021, 01:32:32 pm Quote from: RonB - January 08, 2021, 04:02:20 pmHi MIP; If I remember, that is a heat riser from the exhaust manifold to the choke mechanism on the carburetor. Warm air from the manifold warms up the choke to shut off the rich mixture needed for a cold engine. Pretty quick after the engine is running, but before the hot water and warmth of the intake manifold take over to shut off the choke. Intact you might use a little less gasoline during warm up, but not enough to matter. Larry owned one near this vintage, so he should know for sure. It might have been just to feed warmer air into the air cleaner to evaporate gasoline more easily; some type of smog control. RonBQuote from: Mindispower - January 08, 2021, 03:07:21 pmUpper radiator hose blew. So while peeking around to gauge what I am into repair wise, I found this hose. I tried to find where it goes when it started to rain. It is the hose on the right side, middle of foto. It looks as though it has been 'sheared' off. It is thin walled and ribbed. Bottom of engine is the left side of the foto. Any ideas olease? 1990 G30, 5.7l....Thanks for the help. You are correct.
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